package com.myframework.smhj.spring.aop.support;

import java.lang.reflect.Field;

import org.springframework.aop.framework.AdvisedSupport;
import org.springframework.aop.framework.AopProxy;

/**
 * AOP工具类
 * 
 * @author mo_yq5@163.com
 * 
 */
public abstract class AopUtils extends org.springframework.aop.support.AopUtils {
	/**
	 * 获取 目标对象
	 * 
	 * @param proxy 代理对象
	 * @return
	 * @throws Exception
	 */
	public static Object getTarget(Object proxy) throws Exception {

		if (!isAopProxy(proxy)) {
			return proxy;// 不是代理对象
		}
		if (isJdkDynamicProxy(proxy)) {
			return getJdkDynamicProxyTargetObject(proxy);
		} else { // cglib
			return getCglibProxyTargetObject(proxy);
		}

	}

	private static Object getCglibProxyTargetObject(Object proxy)
			throws Exception {
		Field h = proxy.getClass().getDeclaredField("CGLIB$CALLBACK_0");
		h.setAccessible(true);
		Object dynamicAdvisedInterceptor = h.get(proxy);

		Field advised = dynamicAdvisedInterceptor.getClass().getDeclaredField(
				"advised");
		advised.setAccessible(true);

		Object target = ((AdvisedSupport) advised
				.get(dynamicAdvisedInterceptor)).getTargetSource().getTarget();

		return target;
	}

	private static Object getJdkDynamicProxyTargetObject(Object proxy)
			throws Exception {
		Field h = proxy.getClass().getSuperclass().getDeclaredField("h");
		h.setAccessible(true);
		AopProxy aopProxy = (AopProxy) h.get(proxy);

		Field advised = aopProxy.getClass().getDeclaredField("advised");
		advised.setAccessible(true);

		Object target = ((AdvisedSupport) advised.get(aopProxy))
				.getTargetSource().getTarget();

		return target;
	}
}
